July 08, 2025
Barcelona reaches historic lows in NO₂… but still falls short of 2030 targets
In 2025, Barcelona recorded the lowest nitrogen dioxide (NO₂) levels since monitoring began. According to first-half data, the annual average was 22.5 µg/m³ — well below the current limit (40 µg/m³), but still above the European target for 2030 (20 µg/m³) and the WHO guideline (10 µg/m³).
This decrease is attributed to factors such as frequent rainfall, renewal of the vehicle fleet, expansion of low-emission zones, improvements in public transportation, and increased use of bicycles. However, only three out of the city’s seven monitoring stations currently meet the EU’s 2030 threshold, and none comply with the stricter WHO levels.
Why is this still a public health issue?
Despite the progress, NO₂ pollution continues to severely impact public health in Barcelona: it is estimated to cause around 1,300 premature deaths, 800 cases of childhood asthma, and 120 cases of lung cancer annually. These figures could be significantly reduced if the EU’s 2030 air quality targets were met.
A study by the Barcelona Institute for Global Health (ISGlobal) and the BSC suggests that a 25% reduction in traffic could lower NO₂ levels by 17.6%, potentially preventing around 199 premature deaths each year. Yet even these improvements fall short of meeting the new European directive’s thresholds.
What could the city do better?
The City Council has committed to the “Climate Plan,” with a €1.8 billion investment aimed at renewing bike lanes, public transportation, green spaces, and expanding the metropolitan low-emissions zone. However, experts and local community groups argue that more ambitious measures are needed: electrifying professional transport, introducing stricter restrictions in central areas, and deploying green urban infrastructure such as vegetated rooftops.
Why is this relevant to Wegsco?
At Wegsco, we believe that improving air quality requires more than just rethinking mobility. It also means driving local solutions that reduce car dependency and alleviate health impacts. For example:
- Aquaer, a generator that produces drinking water from air, can ease the pressure on urban water systems.
- Hamwells, with its Blue heat recovery shower system, helps minimize energy use in household water heating.
Progress is real—but not enough. To ensure a fair and effective transition to 2030 standards, we need:
- Bold urban planning (transport decarbonization, green infrastructure).
- Active citizen engagement.
- A strong commitment to complementary technologies like ours, which not only reduce resource demand but help redefine the future of urban life.
As a prelude to such initiatives, you can take inspiration from recent examples like Catalonia’s €1 billion investment in sustainable neighborhoods and explore how European policy and smart urbanism are increasingly intertwined.
